A Multi-Point Contact Model Considering Rough Surface for Linear Ultrasonic Motors: Validation and Simulation

Area of Science:

• Mechanical Engineering
• Tribology
• Robotics

Background:

• Stator-mover frictional contact is critical for linear ultrasonic motor performance and wear.
• Accurate modeling of contact mechanisms is essential for performance prediction.

Purpose of the Study:

• To develop a multi-point frictional contact model for linear ultrasonic motors.
• To enable efficient simulation of static/dynamic contact behaviors and motor performance.
• To investigate the influence of contact interface roughness on motor dynamics.

Main Methods:

• Developed a multi-point frictional contact model using finite element analysis for the stator and an analytical model for the mover.
• Incorporated interface roughness into the contact model.
• Quantitatively measured dynamic contact forces experimentally.
• Validated the model by comparing simulated and experimental contact forces.

Main Results:

• The developed contact model efficiently simulates static/dynamic contact behaviors and motor performance.
• Experimental validation confirmed the model's accuracy in simulating stator-mover contact forces.
• Analysis revealed insights into static force transfer, transient forces, energy exchange, and steady-state performance.
• The study quantified the impact of micro-topography on output performance and force transmission.

Conclusions:

• The presented multi-point frictional contact model accurately predicts linear ultrasonic motor performance.
• Interface roughness significantly affects motor dynamics and force transmission.
• The model provides a valuable tool for optimizing linear ultrasonic motor design and operation.